2025 3 10 Work Session Packet 1

Unverified text extraction. Check the original page for numbers, names, and layout.

ORDINANCE NO. 1138 
Page 5 of 19 
 
(a) A perennial, preferably native, vegetative cover with a uniform (i.e., evenly 
distributed, without large bare areas) density of at least 70 percent has been 
established on all unpaved areas and areas not covered by permanent structures, 
and all slopes and channels have been permanently stabilized against erosion; or, 
(b) Equivalent permanent stabilization measures such as the use of riprap; permanent 
geotextiles; hardened surface materials including concrete, asphalt, gabion baskets 
or Reno mattresses have been employed; or, 
(c) For construction projects on land used for agricultural or silvicultural purposes, 
permanent stabilization may be accomplished by returning the disturbed land to 
its preconstruction agricultural or silvicultural use. 
(28) Point source (or Outfall) means any discernible, confined, and discrete 
conveyance, including but not limited to, any pipe, ditch, channel, tunnel, conduit, well, 
discrete fissure, container, rolling stock, concentrated animal feeding operation, landfill 
leachate collection system, vessel or other floating craft from which pollutants are or may 
be discharged. This term does not include introduction of pollutants from non-point 
source agricultural and silvicultural activities, including stormwater runoff from orchards, 
cultivated crops, pastures, range lands, forest lands or return flows from irrigated 
agriculture or agricultural stormwater runoff. In short, outfall is a point where runoff 
leaves the site as a concentrated flow in a clear, delineated conveyance.  
(29) Pollutant means sewage, industrial wastes, or other wastes. 
(30) Priority Construction means those construction activities discharging directly into, 
or immediately upstream of, waters the state recognized as unavailable condition for 
siltation or Exceptional Tennessee Waters. 
(31) A rainfall event is defined as any occurrence of rain preceded by 10 hours without 
precipitation that results in an accumulation of 0.01 inches or more. Instances of rainfall 
occurring within 10 hours of each other will be considered a single rainfall event. 
(32) Registered Engineer and Registered Landscape Architect An engineer or 
landscape architect certified and registered by the State Board of Architectural and 
Engineer Examiners pursuant to Section 62-202, Tennessee Code Annotated, to practice 
in Tennessee. 
(33) Runoff coefficient means the fraction of total rainfall that will appear at the 
conveyance as runoff. Runoff coefficient is also defined as the ratio of the amount of 
precipitation that is not absorbed by the surface to the total amount of precipitation that 
falls during a rainstorm. 
(34) Sediment means solid material, both inorganic (mineral) and organic, that is in 
suspension, is being transported; or has been moved from the site of origin by wind, 
water, gravity or ice as a product of erosion. 
(35) Sediment basin A temporary basin consisting of an embankment constructed 
across a wet weather conveyance, an excavation that creates a basin, or by a combination 
of both. A sediment basin typically consists of a forebay, dry & wet storage, permanent 
pool, primary spillway, secondary or emergency spillway and surface dewatering device. 
The size and shape of the basin depends on the location, size of drainage area, incoming 
runoff volume and peak flow, soil type and particle size, land cover, and receiving stream 
classification (i.e., waters with unavailable parameters, Exceptional TN Waters, or waters 
with available parameters). 
(36) Sedimentation means the action or process of forming or depositing sediment. 
(37) Significant Contributor is defined as a source of pollutants where the volume, 
concentration, or mass of a pollutant in a stormwater discharge can cause or threaten to 
cause pollution, contamination, or nuisance that adversely impact human health or the 
environment and cause or contribute to a violation of any applicable water quality 
standards for receiving water. 
171